钾离子(K+)是人体新陈代谢过程中重要且必需的阳离子,正常人体血浆中的K+浓度通常在3.5~5.5mmol/L,当K+<3.5mmol/L时称低血钾[1,2],其中3.0~3.5mmol/L称为轻度低血钾症,2.5~3.0mmol/L称为中度低血钾症,K+<2.5mmol/L称为重度低血钾症。低血钾可导致神经肌肉、心血管、泌尿、内分泌和消化等各个系统疾病的发生。临床上低血钾性 Potassium (K +) is an important and necessary cation in human metabolism. K + concentration in normal human plasma is usually 3.5-5.5 mmol / L, and hypokalemia when K + <3.5 mmol / L [1, 2] Of which 3.0 ~ 3.5mmol / L is called mild hypokalemia, 2.5 ~ 3.0mmol / L is called moderate hypokalemia, K + <2.5mmol / L is called severe hypokalemia. Hypokalemia can lead to neuromuscular, cardiovascular, urinary, endocrine and digestive system diseases. Hypokalemia clinical